https://blog.wongcw.com/2018/12/19/%e6%88%b4%e7%88%be%e5%85%a9%e6%ac%be%e7%a7%bb%e5%8b%95%e5%b7%a5%e4%bd%9c%e7%ab%99%e5%b7%b2%e7%b6%93%e5%8d%87%e7%b4%9a%e5%88%b0ubuntu-linux-18-04-lts%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%b5%b1/